During bow, I wear all the essentials, just carry a few of the hand warmers and stick em in the pockets. Also, make a thermos of boilin hot chicken broth. If it was coffee, it'd run through me faster than anything.

During rifle, I have a different setup, enclosed stand, windows, yada yada, except instead of propane heater, I have this great old porcelin sterno stove, which works great. Throws heat like a blast furnace and your stay nice and warm.